Six months ago, this outlet asked whether San Diego was about to get a multi-billion-dollar water bill nobody was talking about honestly. The number has since arrived, itemized, on the doorstep of every ratepayer in the city — and it’s larger than the first estimate. Pure Water San Diego, the largest infrastructure project in the city’s history, needs another $130 million to finish on schedule. The contingency fund set aside to absorb exactly this kind of overrun is nearly empty. And the gap isn’t an abstraction the City Council will quietly absorb — it is already written into the rate increases hitting San Diego water and sewer bills this year and next.
The key finding
When the City Council approved Pure Water’s $1.14 billion first phase in 2021, it set aside $115 million in contingency funding to cover exactly the kind of surprises a decade-long tunneling-and-treatment megaproject reliably produces. That fund is now nearly exhausted. Inflation, combined with serious tunneling and flooding problems during construction of the pipelines, treatment plants, and pump stations, has driven a $130 million cost increase — roughly a 10% jump on the phase-one price tag. City officials say they need the additional funding now to keep construction on pace for substantial completion in early 2027, a deadline that is not discretionary: it is tied to a federal settlement agreement stemming from the Point Loma Wastewater Treatment Plant’s long-standing failure to meet Clean Water Act discharge standards. Miss the deadline, and the city risks reopening a federal compliance fight it spent years negotiating its way out of.
That deadline pressure matters because it removes the normal escape valves a public agency might use to manage a cost overrun — slowing the schedule, re-scoping the project, or waiting for a better financing environment. None of those options are available here without risking renewed federal enforcement action. So the $130 million doesn’t get negotiated down. It gets passed through.
Where the money is actually coming from
The City Council has already approved water rate increases of roughly 63% and wastewater rate increases of roughly 31% phased in over the next four years — increases city staff have been careful to frame as driven primarily by the San Diego County Water Authority’s own rising wholesale rates, not by Pure Water’s construction costs. That framing deserves scrutiny rather than automatic acceptance. Public Utilities Department staff released a cost analysis just before the rate vote showing Pure Water-produced water could ultimately be cheaper than water purchased wholesale from the Water Authority — a comparison that conveniently shifts political blame for near-term pain toward an outside agency while banking on Pure Water’s long-run economics working out as modeled.
The wastewater side of the ledger is where the numbers get harder to spin. San Diego’s wastewater rates are projected to climb as much as 640% cumulatively over four years by some city projections, with the single largest jump — roughly 385% — landing between 2026 and 2027. City officials attribute the spike primarily to the rising cost of energy purchased from San Diego Gas & Electric and the chemicals required to treat wastewater, both essential inputs for running the Pure Water purification process at scale. That is a critical distinction for ratepayers to understand: this is not simply a story about pipes and construction contracts. It is a story about an infrastructure project whose ongoing operating costs are exposed to two of the most volatile input markets in the state — energy and chemical supply — layered on top of the capital cost overruns already discussed. The city has also disclosed it is deferring some of its own capital projects until 2028 and 2029, effectively pushing today’s cost pressure into future budget years rather than resolving it now, a pattern worth watching as those deferred bills eventually come due on top of whatever new overruns Pure Water’s remaining construction phases produce.
The fiscal and accountability angle
This is precisely the kind of story that gets lost in the underlying arithmetic if nobody totals it up in one place: a $1.14 billion project has grown by at least $130 million before reaching substantial completion; the contingency fund built specifically to absorb that risk is essentially gone with construction still underway; and the resulting costs are landing on ratepayers through a rate structure the city’s own staff have worked to frame as someone else’s fault. None of that makes Pure Water a bad project — reducing the city’s 85% reliance on imported water from the Colorado River and Northern California, and eliminating hundreds of millions of gallons of treated wastewater discharge into the Pacific, are legitimate long-term public goods, and this outlet has never argued otherwise. Accountability journalism is not opposition journalism. The point is narrower and more durable: taxpayers and ratepayers are entitled to a clear-eyed account of what the project actually costs, who bears each dollar of overrun, and how officials describe those costs when asking the public to approve the next rate increase.
There is also a broader pattern worth naming. San Diego’s high-speed rail coverage in these pages made a similar point about a different project: costs that escalate steadily over years rarely get corrected until a deadline, an audit, or a public vote forces the numbers into daylight. Pure Water now sits at that same inflection point, with a hard 2027 compliance deadline standing in for the audit trigger. The upcoming rate-structure hearings will be the next test of whether the full cost picture — construction overruns, energy and chemical exposure, and deferred capital spending — gets presented to San Diegans in one coherent accounting, or in the same piecemeal fashion that has made it difficult, until now, to see the whole bill at once.
San Diego is also positioning itself, in the years ahead, as a potential regional exporter of purified water capacity to drought-stressed neighbors in Arizona and Nevada — a long-term revenue possibility that could eventually offset some of what ratepayers are absorbing today. That possibility is real, but it is also years away and dependent on infrastructure that hasn’t yet cleared its current cost hurdles. Ratepayers footing today’s bill are entitled to know the difference between a future revenue opportunity and a present-day certainty.
The $130 million is not the last number this project will produce. Whether it’s the last one San Diegans hear about only after the contingency fund is already spent is a separate question — and one the city has yet to answer.
That question will get its next real test at the City Council’s upcoming rate-structure hearings, where staff are expected to present updated Pure Water cost figures alongside the broader utility rate picture. Past hearings on this project have drawn heavy public turnout and pointed questioning from councilmembers about whether ratepayers are being given the full picture before being asked to approve the next round of increases. Given the pattern established with this overrun — a contingency fund drawn down before the project reaches completion, framed alongside a rate increase attributed primarily to an outside wholesale supplier — that scrutiny is warranted, and it is the kind of scrutiny this outlet intends to keep applying as Pure Water moves through its remaining construction phases toward the 2035 target for supplying nearly half the city’s water locally.
Jose Navarro is the founder of The Navarro Report and holds an MBA. He applies a financial-analyst lens to government spending, institutional accountability, and fiscal oversight stories.
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